Apparatus for injection molding
AssigneeThe Goodyear Tire & Rubber Company
InventorThomas John Boyd
Life of this patent
Estimating the term…
Abstract
The injection molding machine has an extruder for providing molding material, a cavity for retaining the molding material prior to injection into a mold, a plunger within the cavity to move the material out of the cavity, and a check valve. The check valve has separate means to permit the material to flow from the extruder to the cavity and from the cavity to an adjacent mold. By having separate flow channels for molding and recharging, the injection molding machine may be recharged on the fly.
Claims10
An apparatus for injection molding material into a mold, the apparatus comprising an extruder for providing molding material, a cavity for retaining the molding material prior to injection into a mold, a plunger within the cavity to move the material out of the cavity, a check valve, the check valve being characterized by:
- the check valve comprising separate means to permit the material to flow from the extruder to the cavity and from the cavity to a mold;
- the check valve having an external shape that inhibits rotation and misalignment of the check valve.
An apparatus for injection molding material into a mold, the apparatus comprising an extruder for providing molding material, an apparatus cavity having an access port for receiving the molding material prior to injection into a mold, a plunger within the cavity to move the material out of the apparatus cavity, a check valve, the check valve being characterized by:
- (a) an internal transfer column cavity moving axially along a check valve centerline relative to the apparatus cavity access port;
- (b) an entrance port communicating with the transfer column cavity and allowing passage of the molding material from the extruder to the transfer column cavity;
- (c) an exit port communicating with the transfer column cavity and allowing passage of the molding material from the transfer column cavity into the apparatus cavity;
- and
- (d) an injection outlet port for allowing passage of the molding material from the apparatus cavity through the check valve.
Dependencies are inferred from the claim text.